| Quote #1
In his mind a new song had come, the Song of Evil, the music of the enemy, of any foe of the family, a savage, secret, dangerous melody, and underneath, the Song of the Family cried plaintively. (1.14)
Kino defines as evil anything that threatens the safety of his family.
| Quote #2
Kino knelt beside his wife. "So the doctor knew," he said, but he said it for himself as well as for his wife, for his mind was hard and suspicious and he was remembering the white powder. Juana rocked from side to side and moaned out the little Song of the Family as though it could ward off the danger, and the baby vomited and writhed in her arms. Now uncertainty was in Kino, and the music of evil throbbed in his head and nearly drove out Juana's song. (3.51)
Kino has a keen sense of evil, more so than his wife, who is fooled by the doctor’s dissembling.
| Quote #3
But Kino's brain burned, even during his sleep, and he dreamed that Coyotito could read, that one of his own people could tell him the truth of things. And in his dream, Coyotito was reading from a book as large as a house, with letters as big as dogs, and the words galloped and played on the book. And then darkness spread over the page, and with the darkness came the music of evil again, and Kino stirred in his sleep; and when he stirred, Juana's eyes opened in the darkness. And then Kino awakened, with the evil music pulsing in him, and he lay in the darkness with his ears alert. (3.70)
That Kino senses evil by hearing a song is a suggestion that he’s operating on intuition, not on conscious thought.